Improvement in the valve-gear of steam-hammers



UNITED STATES PATENT OFFICE..

JAMES WATT, OF BUFFALO, NEW YORK.

Specitication forming part of Letters Patent No. 50,407, dated October10, 1865.

T0 all whom it may concern:

Be it known that I, J AMES WATT, ofthe city of Buffalo, county of Erie,and State of New York, have invented Improvements in Steam- Hammers; andI do hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,making a part of this specification, in which- Figure I is a transversesection, passing through the piston-cylinder and steam-chest. Fig. 1I isa longitudinal elevation.

Letters of like name and kind refer to like parts in each of thefigures.

The nature ot' this invention relates, iirst, to a mode of adjusting thevalve-gear of steamhammers so as instantly to take or cut oif steam atany part of the stroke; second, to using the exhaust-steam upon thepiston in a manner to increase the force of the blow.

A represents the bed or foundation upon which the operating parts aresupported; B, steam-hammer. This is jointed or hinged to the standard Oby a hinge-bolt or shaft, as shown at D. E, anvil, F, piston-cylinder;G,

' piston-head; H, piston-rod; I, steam-chest; J,

steam-port leading from the steam-chest and passing under thepiston-head; K K', exhaustports leading from the steam-chestdirectlyover the piston-head, so that the force ofthe exhaust will be exerted onthe piston-head, and by reason of such force or pressure increase theforce of the blow given by the hammer, L, shaft which connects with thepistonrod, as shown at l. The ends of this shaft are supported injournal-boxes m, which journalboxes move up and down in appropriateslots made in the uprights N.

O are connecting-rods, which connect this shaft with the hammer by meansof the hingeshaft P. The shaft P has appropriate hingeconnection withthe under side'of the hammer, so that the connection of the hammer withthe piston is complete. Q, steam-valve-an ordinary slide-valve; Q', rodwhich connects the steam-valve with the cam-shaft S.

R is a cam-lever, which is rigidly connected with the shaft S andprojects upwardly and supports the cams T U. These cams are soconstructed as to slide up and down upon this lever as may be requiredfor placing them at any desired point for cutting off the steam. Each ofthese cams is connected with the shaft S by means of the connecting-rodsVV and short arms W. One of the short arms W is connected with the shaftS, and the other connects with a sleeve which slides over a portion ofsaid shaft. One of the operating-levers X is connected with the shaft S,and the other is connected to the sleeve over said shaft, so that theoperator, by moving one of the levers X, moves the cam connectedtherewith, by which means either cam may b'e moved and placed and heldat any point desired for cntting oi' the stroke.

Y is a bent bar with notches therein for holding the levers X securelyat such point as they may be placed.

Z is an arm, which is connected firmly with the shaft L and projectstherefrom and moves up and down with said shaft and piston-rod. Thereare two pins, Z Z2, which project from this arm, and are so iixed as tocome in contact with the cams at whatever point they may be placed.

By means of the connections already described it will be seen that oneof these cams operates the steam-valve to cut oi` and the other toexhaust steam.

It will also be noticed that the operator can change the position ofthecams instantly and place them just where he desires, and hence has aperfect and instant control over the hammer to control each blow forthick or thin iron, long or short blows, without any loss of time.

VVh-at I claim as my invention, and desire to secure by Letters Patent,is

1. The arrangement of the cams T U, with their connections, so that theymay be placed and used in such position as to insure the taking andcutting off of steam instantly at any part ot' the movement ot' thehammer, substantially as set forth.

2. The exhaust-ports K K', so arranged that the exhaust-steam may be leddirectly from the steam-chest over the piston-head, and thereby increasethe force of the blow given by the hammer, substantially as described.

JAMES WATT.

Witnesses:

M. P. FTLLMOEE, E. B. FoEBUsH.

